My DW got really sick last time we went. Just a bad cold, I think. I think it can sometimes be the combination of flying and being in a new place with tons of foreign germs everywhere. I don't have any tips, though. Sorry.
Oh and I just saw Drummer's Wife asked me a question a long time ago. Sorry! We did the dining plan each visit, it's just the counter services were on the plan. Basically it's the cheapest plan. I think it amounts to $20/day/person. It was great! We had plenty of food and had snacks left over to bring home a bunch of mouse krispy treats! Love those!! But now after doing all three dining plans (budget, medium & deluxe) we'll be sticking with the medium one from now on. We like being able to reserve some table services (we LOVE Disney restaurants!!!) and still do some counters at the same time. I think that plan was around $40/person/day. Don't quote me on that though. The BEST time to go for dining is during their free dining package times. We would just upgrade from the budget plan to the medium or deluxe for a lot less, since the budget one was free! Hope that helps some.